SYMPATHETIC CELLS: ALBINO RAT 301 
The rate of increase in the number of the large cells in the 
superior cervical ganglion is, if anything, a little lower in the 
females before twenty days and a little higher later. On the 
other hand, the increase in size shows only chance variations 
during the first seventy days. These variations are subject to the 
influence of both age and body weight of the young animal, but 
puberty is attained, sex begins to be significant in addition to 
the other two factors. 
If there is not too much difference between the ages and the 
body weights of the male and of the female, then the difference 
found in the quantitative development of the cytoplasm between 
the two may be attributed to this influence of sex. In table 8 
TABLE 8 
Giving, according to sex, the average computed diameters of the cell and the nucleus 
for three groups of body weights of albino rats. In the last column are given the 
ratios between the cell and the nucleus diameters. Data condensed from table 2 
DIAMETERS 
SEX ie daaad eF BODY WEIGHT Ses ie DIAMETER OF 
Cell Nucleus NUCLEUS TO CELL 
See Wap Gams i) Ge. | eal 
sh 4 5.6- 18.9 22.9 12.1 1:1.89 
Q 5 6.3- 19.0 23.1 11.4 1:2.03 
a 7 23.8-105.1 27.2 12.9 Ieper 
2 9 25.5-107.0 27.7 13.1 ede iltt 
of 5) 143. 5-230.0 30.6 13.6 1:2.25 
2 4 123.8-170.6 31.6 13.5 1:2.34 
is given a condensed statement of the cell measurements according 
to sex, based on body weights as these appear in table 2. For 
the cell body the values are in favor of the female for all three 
groups. 
After puberty the sympathetic neurons in the female tend to 
have larger cell bodies and the small cells transform more rapidly. 
At the moment it would not be wise to infer that similar rela- 
tions would be found in other sympathetic ganglia or in other 
strains of rats; nevertheless, as they stand, the results agree with 
the suggestion of Dunn (’12) that the mass of the peripheral 
nervous system in the female albino rat is greater in proportion 
to the body weight than in the male. 
